Engine overheating, help!!!
Thread Starter
Joined: May 2001
Posts: 1,427
Likes: 496
From: Pflugerville, Texas
Car: 92 Heritage Camaro Z28
Engine: 350 TPI
Transmission: auto
Axle/Gears: 3.23 Limited Slip
Engine overheating, help!!!
My engine started heating alittle bit last week (up to about 210 with a 180 thermostat)
I finally noticed that one of the fans is not working. Is it electrical or is there a seperate relay/fuse for this?
Also, since I lowered my thermostat from 195 to 180, someone told me I have to change the fan switch relay to match the new 180 thermostat? Is this true?
Any help would be greatly appreciated!!!
Manny
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92 Bright Red z28, 350, 47k miles, pw, pl, power mirrors, power drivers seat, rear defroster, limited slip performance axle, 4 wheel discs, red leather interior and the Heritage Package!!
I finally noticed that one of the fans is not working. Is it electrical or is there a seperate relay/fuse for this?
Also, since I lowered my thermostat from 195 to 180, someone told me I have to change the fan switch relay to match the new 180 thermostat? Is this true?
Any help would be greatly appreciated!!!
Manny
------------------
92 Bright Red z28, 350, 47k miles, pw, pl, power mirrors, power drivers seat, rear defroster, limited slip performance axle, 4 wheel discs, red leather interior and the Heritage Package!!
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Joined: Jan 2000
Posts: 19,660
Likes: 311
Manny,
The ECM controls the operation of the primary cooling fan and depends on the CTS for an accurate reading of the engine temperature. The typical turn-on point is 223°F coolant temperature. The secondary fan is operated by a separate temperature sensing switch in the right cylinder head. IIRC, the setpoint of this sensor is around 234°F. If the fans don't operate at the same time, it's becasue it is designed that way.
You can install a separate fan control, reprogram the ECM PROM to run the fan at a lower temperature, or replace the secondary fan temperature sensor with a lower setpoint unit. The separate fan control is fairly easy, and can cost as little as $40.00.
If one of the fans doesn't operate at all, you either have a control problem or the engine never gets warm enough to start the second fan.
------------------
Later,
Vader
------------------
"Let the bodies hit the floor!"
Adobe Acrobat Reader
The ECM controls the operation of the primary cooling fan and depends on the CTS for an accurate reading of the engine temperature. The typical turn-on point is 223°F coolant temperature. The secondary fan is operated by a separate temperature sensing switch in the right cylinder head. IIRC, the setpoint of this sensor is around 234°F. If the fans don't operate at the same time, it's becasue it is designed that way.
You can install a separate fan control, reprogram the ECM PROM to run the fan at a lower temperature, or replace the secondary fan temperature sensor with a lower setpoint unit. The separate fan control is fairly easy, and can cost as little as $40.00.
If one of the fans doesn't operate at all, you either have a control problem or the engine never gets warm enough to start the second fan.
------------------
Later,
Vader
------------------
"Let the bodies hit the floor!"
Adobe Acrobat Reader
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